The EAN-2 is a supplement to the EAN-13 and UPC-A barcodes. It is often used on magazines and periodicals to indicate an issue number.
The Encoding of EAN-2 characters is very similar to that of the other European Article Numbers. The only difference is that the digits are separated by 01. The EAN-2 always begins with '01011.' Also, the R-Code is not used.
The structure of the barcode is based on the value of the two digit to be encoded. The two digits treated as a single two-digit number is reduced modulo 4 and used to find the parity pattern to be used. The parity pattern repeats every 4 values.
|Data to encode||Parity pattern|
|00||LL||Encode as 0 from L table followed by 0 from L table|
|01||LG||Encode as 0 from L table followed by 1 from G table|
|02||GL||Encode as 0 from G table followed by 2 from L table|
|03||GG||Encode as 0 from G table followed by 3 from G table|
|04||LL||Encode as 0 from L table followed by 4 from L table|
|05||LG||Encode as 0 from L table followed by 5 from G table|
|06||GL||Encode as 0 from G table followed by 6 from L table|
|07||GG||Encode as 0 from G table followed by 7 from G table|
|98||GL||Encode as 9 from G table followed by 8 from L table|
|99||GG||Encode as 9 from G table followed by 9 from G table|
|Start||5 (L)||Separator||3 (G)|